53021810 has 32 divisors (see below), whose sum is σ = 102730032. Its totient is φ = 19630080.

The previous prime is 53021807. The next prime is 53021821. The reversal of 53021810 is 1812035.

It can be written as a sum of positive squares in 8 ways, for example, as 2455489 + 50566321 = 1567^2 + 7111^2 .

It is a super-2 number, since 2×53021810² = 5622624671352200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7814 + ... + 12926.

Almost surely, 2^53021810 is an apocalyptic number.

53021810 is a deficient number, since it is larger than the sum of its proper divisors (49708222).

53021810 is a wasteful number, since it uses less digits than its factorization.

53021810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5198.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 53021810 is about 7281.6076521603. The cubic root of 53021810 is about 375.6800932569.

Adding to 53021810 its reverse (1812035), we get a palindrome (54833845).

The spelling of 53021810 in words is "fifty-three million, twenty-one thousand, eight hundred ten".